*{
    margin: 0;
    padding: 0;
}
li{
    list-style: none;
}
a{
    text-decoration: none;
}
.main{
    margin: 0 auto;
    width: 1200px;
}
.fl{
    float: left;
}
.fr{
    float: right;
}
.fs{
    font-size: 12px;
}